Would like to bring up the topic of set bonus discussion:
After browsing through the sets, looking at Zerae set for specific testing since everyone calls it a meme, It seems that a lot of the available sets don't give enough pierce for how many gear slots it takes to gain the bonus. Granted, some classes have skills like Stormzon's Asterism to boost more pierce, but another example: The Vasily's Javelin set. It takes five slots to equip, but the only pierce available in the set is the full set bonus and it only gives -30% cold pierce.
More examples are the assassin weapon damage sets. The caster sets are fine since you can utilize Phase Bomb for some more pierce, but the weapon damage set lacks heavily. The dual claw set is a bit better, as it gains -45% fire and poison from the full set and -15% fire and poison from the belt, but that's all it gives, and it leaves you with gloves and boots to make up the other 60-75% pierce to hit the maximum output for general mobs. The Naginata set which focuses on poison gives -30% as a full set, and up to -30% more from the armor. That's still only -60% poison pierce for a pretty large investment of gear.
Granted, these are underused sets, and yes, you can get a pretty healthy amount (-30%? 35%?) from rings and amulets, and another 5-10% (depending on your type of elemental damage) from the Iotss and LC1 charms, but even then, you're struggling to hit the cap values for general gameplay with a full set investment, without filling your inventory with cycles.
I think when the damage rework came, these numbers were all adjusted globally without a lot of consideration on how a build might be made to fit the new reduced numbers, especially now since monster resists were raised to require 120-135% pierce to deal maximum damage.
I'm not pointing fingers or calling out bad item design, but rather just bringing it to attention that full set bonuses took a huge hit with the damage rework, and I don't think many people have noticed it as much since everyone and their sister only wants the Cinadide or Lightning sorc set now.
Some other instances, previously mentioned in this thread, I think, were things like the Treewarden set still giving Plague oskill, presumably from the time when Plague added a lot more poison damage as an uberskill than a Holy Melee Tree skill, and also giving no poison pierce from the set bonuses or items to help the skill perform even slightly well. Other things in that set specifically are Fortress on Attack proc, which was great back when Pummel was around since you could proc on attack (unlike Thorn Strike).
I won't go into detail on every set's flaws, since I'm sure most are already pointed out or known, and I'm not one to say, "this game sucks, the items need to be sssu to be strong or I quit." I guess I'm just calling for sets to be looked at again when the time is available amongst the other changes being done to MXL and Sigma to help make them more valuable and feel as beneficial as a set should feel, across the board, not just a few commonly used ones. Largely referring to the elemental pierce on most sets from the damage/number rework, but there are other bits and pieces that may need adjusted as well.